Sensitized Electroluminescence on Mesoporous Oxide Semiconductor Films

Forward biasing of a mesoporous TiO2 (anatase) film whose surface is derivatized with a monolayer of the phosphonated ruthenium bipyridyl complex RuL2L‘ with L = 4,7-diphenyl-1,10-phenanthroline and L‘ = 2,2‘-bipyridine-4,4‘-diphosphonic acid produces electroluminescence in the presence of an electr...

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Bibliographic Details
Published in:The journal of physical chemistry. B 1997-04, Vol.101 (14), p.2558-2563
Main Authors: Athanassov, Yordan, Rotzinger, François P, Péchy, Péter, Grätzel, Michael
Format: Article
Language:English
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Summary:Forward biasing of a mesoporous TiO2 (anatase) film whose surface is derivatized with a monolayer of the phosphonated ruthenium bipyridyl complex RuL2L‘ with L = 4,7-diphenyl-1,10-phenanthroline and L‘ = 2,2‘-bipyridine-4,4‘-diphosphonic acid produces electroluminescence in the presence of an electrolyte containing peroxodisulfate in dimethylformamide. Light emission arises from the MLCT excited state of the complex which is generated directly through interfacial electron transfer from the conduction band of the semiconductor to the π* orbital of the oxidized Ru(III) state of RuL2L‘. The nanocrystalline morphology of the oxide film used here as electron injection electrode plays an important role in enhancing the electroluminescence process.
ISSN:1520-6106
1520-5207
DOI:10.1021/jp962192j